Hi ppl. I didnt find a good answer for my problem, so i will ask.

I just change the alternator on my 4.8is, and when the car was on the ramp, i see some coolant exactlly between the engine and gearbox.

Can someone tell me please whats wrong, and what i have to check ?

Thanks

There is a coolant channel at the back of the engine.

Basically a hole where coolant comes out, then goes back in. There is a steel panel with a rubber gasket on it. I believe this is your issue.

The bad news is the gearbox must be removed to access it.

https://youtu.be/F_gjFZJbAoE

It could be other things (I think), but this is the worst case scenario.

Could be valley pan.